Prime Minister Theresa May ridiculed Jeremy Corbyn's record as Labour leader in his final appearance before his contest with challenger Owen Smith is settled.

"I recognise that this may very well be the last time that he has an opportunity to face me across this dispatch box - certainly if his members of parliament have anything to do with it, " she said at Prime Minister's Questions.

She added: "I accept that he and I don't agree on everything, well actually be don't probably agree on anything."

Mrs May added a barbed tribute to Mr Corbyn, who in spite of opposition from his MPs is favourite to be returned as leader thanks to huge support among his party's voting membership.

"He has made his mark," she told the Commons. "He wants coal mines without mining them, submarines without sailing them and he wants to be Labour leader without leading them."

She added: "One thing we know: whoever is Labour leader after their leadership election, it will be the country that loses."

The deadline for ballot papers to be returned in the contest between Corbyn and Smith is September 21, with the result to be announced at a special conference in London three days later.

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Jeremy Corbyn accused Theresa May of pursuing an education policy of "segregation" as the pair clashed at Prime Ministers Questions over the Government's aim to introduce new grammar schools.

The Labour leader dedicated a series of questions to the controversial policy, challenging the Prime Minister to name any education experts that back her on introducing more selection into schools.

Mrs May refused to name a significant backer, but accused Mr Corbyn of living in the past, saying: "Can I say to the honorable gentleman that he needs to stop casting his mind back to the 1950s."

Jeremy Corbyn accused the Government of introducing a system of segregation.

Despite opposition from some sections of her own party - including the outgoing former prime minister David Cameron - on selection, she attempted to define the difference between her party and her rival leader.

"He believes in equality of outcome. We believe in equality of opportunity," she said. "He believes in levelling down. We believe in levelling up."

Mr Corbyn replied: "Equality of opportunity is not segregation at the age of 11."

Mrs May said both leaders had benefitted from the system. "He went to a grammar school. I went to a grammar school. It's what got us where we are today."

Mr Corbyn said he wanted the education system to offer "good education for every child".